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Summary
Hunters know that the Men of Letters don't exist—so when a man named Castiel shows up on one of the Winchester's hunts and introduces himself as one, they're suitably suspicious. He comes with news of a prophecy that tells of a demon uprising and names Sam and Dean as the only ones who can prevent it. Despite their misgivings, the Winchesters agree to help and find themselves entangled in a world of magic and tradition like nothing they've ever encountered. As they learn more about the Men of Letters and their mysterious prophecy, Sam, Dean, and Castiel face choices that could change the course of history, and whose fallout could bring them closer together...or tear them apart.
